DEVELOPMENT OF CORRELATION BETWEEN CBR AND MINI-DCPT VALUES

Abstract

Soil has been used as a foundation and construction material since the earliest days of recorded history. Therefore, it was inevitable that earthwork and foundation engineering developed primarily as an art and empirical practices based on earlier successful accomplishments. During the past sixty years notable advances have been made in the knowledge of the physical properties of soil and in understanding the theories of earth actions. Significant changes have occured in design and construction. Practices and while experience remains the single most important requisite to success, rational design methods have largely supplianted role of thumb-techniques. In order to apply these design techniques, it is very important to have a fair idea about the properties of soil as it exists in in-situ. The aim of testing should be to obtain reasonably representative values of the soil properties that are reliable and have a direct and significant bearing upon the solution of practical problem in foundation and highway engineering. The prime objective of a pavement design is to determine the thicknesses of different layers so that the pavement surface can bear the load without any distress. One of the most popular methods of flexible foundation design is based on CBR value of subgrade soil. CBR method of design is responsible for more than half of all the pavements now under construction throughout the world. CBR test, through simple, is time consuming, adhoc in nature and requires strict adherance to the test procedure to obtain the reliable and reproducible results.